Immersion bath roll and a method for the manufacture of an immersion bath roll

Abstract

In accordance with the invention an immersion bath roll is suggested for an immersion bath with liquid metal with a roll body ( 2 ), extending along a longitudinal axis (A), as well as essentially cylindrical bearing journals ( 3 ) for the cooperation with bearing sleeves for the mounting of the immersion bath roll ( 1, 1 a, 1 b ), wherein each bearing journal ( 3 ) possesses at least one groove ( 4 ), which extends in the circumferential over the total circumference of the bearing journal ( 3 ), and which is filled with a protective layer ( 41 ) produced by thermal spraying.

1 . An immersion bath roll for an immersion bath with liquid metal with a roll body ( 2 ) extending along a longitudinal axis (A), as well as essentially cylindrical bearing journals ( 3 ) for the cooperation with bearing sleeves for the mounting of the immersion bath roll ( 1 ,  1   a,    1   b ), characterized in that each bearing journal ( 3 ) has at least one groove ( 4 ), which extends in the circumferential direction over the total circumference of the bearing journal ( 3 ) and which is filled up with a protective layer ( 41 ) produced by thermal spraying. 
     
     
         2 . An immersion bath roll in accordance with  claim 1 , wherein the protective layer ( 41 ) contains molybdenum, molybdenum carbide or a mixture of molybdenum and molybdenum carbide. 
     
     
         3 . An immersion bath roll in accordance with  claim 2 , wherein the molybdenum content or the molybdenum carbide content or the content of the mixture of molybdenum and molybdenum carbide of the protective layer ( 41 ) is at least 40 percent per weight. 
     
     
         4 . An immersion bath roll in accordance with  claim 1 , wherein a plurality of grooves ( 4 ) is provided on each bearing journal ( 3 ), wherein neighbouring grooves ( 4 ) are separated by a web ( 5 ). 
     
     
         5 . An immersion bath roll in accordance with  claim 4 , wherein for each bearing journal ( 3 ) the webs ( 5 ) form at least 30% of the surface area of the bearing journal ( 3 ). 
     
     
         6 . An immersion bath roll in accordance with  claim 4 , wherein each web ( 5 ) has a width (B 1 ) of 3 mm to 15 mm. 
     
     
         7 . An immersion bath roll in accordance with  claim 1 , wherein each groove ( 4 ) has a width (B 2 ) of 3 mm to 20 mm. 
     
     
         8 . An immersion bath roll in accordance with  claim 1 , wherein each groove ( 4 ) has a depth (T) of at least 50 micrometers. 
     
     
         9 . An immersion bath roll in accordance with  claim 1 , wherein each groove ( 4 ) has a depth (T) of 100 to 200 micrometers. 
     
     
         10 . An immersion bath roll in accordance with  claim 1 , wherein the protective layer ( 41 ) is additionally provided on the webs ( 5 ), wherein the protective layer ( 41 ) on the surface of the webs ( 5 ) has a thickness of at least twenty micrometers and preferentially of 50 to 100 micrometers. 
     
     
         11 . A method for the manufacture an immersion bath roll for an immersion bath of liquid metal with a roll body ( 2 ), which extends along the longitudinal axis (A), as well as essentially cylindrical bearing journals ( 3 ) for cooperation with bearing sleeves, characterized in that at least one groove ( 4 ) is provided on every bearing journal ( 3 ), and extends in the circumferential direction over the total circumference of the bearing journal ( 3 ), wherein the groove ( 4 ) is filled with a protective layer ( 41 ) applied via by thermal spraying. 
     
     
         12 . A method in accordance with  claim 11 , wherein the groove ( 4 ) is filled with a material containing molybdenum or a material containing molybdenum carbide. 
     
     
         13 . A method in accordance with  claim 11 , wherein the groove ( 4 ), is filled either by plasma spraying, or flame spraying or arc spraying.